Using Tax Tables while not showing tax/Net Price on Invoices

[Michael L. Boscia]

Hello,

I am new to gnuCash and am excited to be using it.  My question is
regarding showing tax info on invoices.

I would like to charge my customers for my Consulting services.  Lets say I
charge $20/hr and expect to pay 25% tax.  I would like to have the tax
table post $5 tax to my Liabilities:Income Taxes Payable account without
showing a breakdown with taxes on the invoice such as
--invoice snippet--
Date Description Charge Type Quantity Unit Price Total
03/03/2013 Programming Hours 10.00 $20.00 $150.00

Net Price          $150.00
Tax            $50.00
Total Price   $200.00
Amount Due $200.00
--end invoice snippet--

Stated another way-
I would like to calculate the taxes for the purpose of setting the money
aside, but I do not want to show the taxes on the invoice.  How would I use
a Tax Table to set aside 25% taxes from an invoice but not show the "taxes"
on the invoice?

Thanks Much,

Mike